U1137 – Lost Communication with Fuel Level Sensor ‘A’.

The ODBII code U1137 indicates that there is a communication failure between the vehicle’s control module and the fuel level sensor ‘A’, which may affect the accurate reading of the fuel level.

The severity of ODBII code U1137 is generally considered moderate.

Common Causes For: U1136 SCP (J1850) Invalid or Missing Data for Telltales

• Faulty fuel level sensor
• Damaged wiring or connectors
• Poor ground connection
• Failed engine control module (ECM)
• Corroded or loose electrical connections
• Short circuit in the wiring harness
• Intermittent signal loss
• Faulty fuel gauge or instrument cluster
• Software issues in the ECM

Common misdiagnosis for U1137 Lost Communication with Fuel Level Sensor ‘A’.

• Faulty fuel level sensor
• Wiring issues or damaged connectors
• Faulty engine control module (ECM)
• Incorrectly calibrated fuel gauge
• Fuel tank issues (e.g., float malfunction)
• Faulty body control module (BCM)
• Software glitches in the vehicle’s computer system

Common Troubleshooting Steps

When dealing with the OBD-II code U1137, which indicates “Lost Communication with Fuel Level Sensor ‘A’,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues present.
• Inspect the Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors associated with the fuel level sensor for any signs of damage, corrosion, or loose connections.
• **Connector Pins: Ensure that the pins in the connectors are not bent or corroded.
• Test the Fuel Level Sensor: **Resistance Check: Use a multimeter to measure the resistance of the fuel level sensor. Compare the readings to the specifications provided in the vehicle’s service manual.
• **Functionality Test: If possible, test the sensor by applying a known voltage and checking if the output changes accordingly.
• Check the Fuel Level Sensor Circuit: **Continuity Test: Perform a continuity test on the wiring between the fuel level sensor and the engine control module (ECM) to ensure there are no breaks in the circuit.
• **Voltage Check: Check for proper voltage supply to the fuel level sensor. Ensure that the sensor is receiving the correct voltage as specified in the service manual.
• Inspect the ECM: **Connections: Check the connections at the ECM for any signs of damage or corrosion.
• **Software Update: In some cases, a software update for the ECM may be necessary. Check with the manufacturer for any available updates.
• Check for Ground Issues: Ensure that the fuel level sensor has a good ground connection. A poor ground can lead to communication issues.
• Scan for Communication Issues: Use a scan tool to check for communication between the ECM and the fuel level sensor. If there are communication errors, it may indicate a problem with the bus system.
• Inspect Other Related Components: Check other components that may affect the fuel level sensor, such as the fuel pump module or any related sensors.
• Clear Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns.
• Consult a Professional: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has access to advanced diagnostic tools and equipment. By following these troubleshooting steps, you should be able to identify the cause of the U1137 code and take appropriate action to resolve the issue.